JPS6098854A - Ac generator - Google Patents

Abstract

PURPOSE:To reduce the leakage magnetic flux from the end of a pole of a rotor to the opposed reverse pole of a disc by forming a pair of substantially chamfered portions radially of the pole disc. CONSTITUTION:A toothed portion 20 of a pole has a substantially arcuate-shaped end 21 including the prescribed radius. A skirt portion 22 of substantially trapezoidal shape is formed continuously to the end 21. A pair of chamfered portions 25 with the prescribed angle are formed at both sides of the skirt 22. A pair of chamfered portions 35 are formed radially on a magnetic disc 30 continued to the portion 25. Further, a collar 26 is formed along a rectilinear line for coupling the both ends of the bottom of the skirt 22 from the both ends of the end 21 at the front. The toothed portion 20 has a side 28.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an alternating current generator, and particularly to an improvement in the 1NU (ball core) shape of a rotor of a three-phase alternating current generator for a vehicle.

(Conventional problems) The conventional ball core has a trapezoidal tip, and the leakage magnetic flux is large between the adjacent W (W) of this ball core, and a large output is not produced in relation to the excitation force. In order to improve this point, for example, as seen in U.S. Pat. No. 3,004,181, a flange is provided on the outer surface of the ball core to increase the area of the 11 poles, while the inner side of the ball core is "scraped" so that they face each other. There is a method to reduce leakage magnetic flux by increasing the magnetic resistance between different poles.

However, although simply providing a brim shape as in this method reduces the leakage magnetic flux on the side surface of the trapezoidal ball core,
The disadvantage is that the leakage magnetic flux flowing from the tip of the trapezoidal ball core to the opposing ball core disk section (disc section) increases more than in the case of a flat ball core, and there is almost no effect on reducing leakage magnetic flux as a whole. That was the actual situation.

(Object of the present invention) The present invention has been made in view of the above problems, and is an IC.
The purpose of this invention is to reduce the leakage magnetic flux from the side surfaces of the rotor magnetic poles of an alternator, and further to reduce the leakage magnetic flux flowing from the tips of the magnetic poles to the opposed ball core disk parts.

(Structure of the present invention) The present invention is characterized in that a plurality of magnetic pole teeth provided on a pair of magnetic pole disk portions are formed with arc-shaped tip portions having a predetermined radius, and further, a pair of magnetic pole tooth portions provided on a pair of magnetic pole disk portions are formed with arc-shaped tip portions having a predetermined radius. This is an alternator that includes a rotor with a chamfered portion. Furthermore, in addition to the above configuration, the present invention relates to a base portion in which the 16-pole tooth portion is substantially tapered from the tip portion, and this base portion and the tip portion.
It has a 476 configuration with a trapezoidal cross section.

In addition to all of the above configurations, the present invention further has a configuration in which the magnetic pole teeth form another pair of chamfered portions formed on the skirt 815 in one direction, +I.

(Conventional specific problem fish) The attached drawings will be explained below. FIGS. 1(a) and 1(b') show the magnetic pole portions of the rotor of a conventional alternator. A pair of magnetic pole disk portions 1 are arranged to face each other, and have a plurality of magnetic pole tooth portions 2 spaced apart from each other around each disk portion 1 (, 1a). A flange 3 is formed in the direction, and they are alternately meshed with opposite polarity across a window space.The tips of the teeth 2 are trapezoidal and extend from the corner 4 to the right.

The tooth 2 further has a side surface 5 and a tapered bottom surface 6. FIG. 2 shows the rotor and stator portions of a conventional alternator. In FIG. 2, C17 is a stator coil, 8 is a stator core, 9 is a rotor coil, and 10 is a rotor shaft.

In the alternator rotor shown in Figures 1 (a) and (11) and Figure 2, the magnetic flux φlb leaking from the tip of the magnetic pole teeth to the opposite pole is that of a conventional trapezoidal magnetic pole without a flange. This increased leakage magnetic flux φゎ is due to the enlarged magnetic pole area of the stator and rotor, which can be obtained by using the flange shape!
! In particular, when the load current flows and the so-called electromagnetic reaction ampere turns occur and increase, this air gap permeance will be lower than that of conventional brimless magnetic poles. However, since the field magnetomotive force is also high and opposes this, most of the magnetic flux cannot pass through the iron part of the rotor and flows through the stator/rotor space. , the leakage magnetic flux φ increases significantly, so the shape of the brim for the purpose of expanding the magnetic pole area not only becomes less effective in reducing air gap permeance as the load current increases, but also has a shape that is smaller than that of a trapezoidal magnetic pole without a brim. On the contrary, the result is that the l1ii leakage flux increases.

(One Embodiment of the Present Invention) One embodiment of the present invention will be described with reference to FIGS. 3 to 8.

The basic structure of the vehicle alternator according to the present invention is the same as that of the conventional one. FIG. 3 does not show the relative positional relationship between the magnetic poles of the stator and the magnetic pole teeth of the rotor.

In Fig. 3, τ indicates the magnetic pole pitch of the rotor, which is 1° (4
Accepts the length of the bottom of the rotor magnet 4~south. The length of the base (4 is approximately 14ζ3τ.

FIG. 4(a) and (I)) show the front and top surfaces of the southern part of the magnetic pole. The magnetic pole tooth portion 20 has a substantially arcuate tip portion 21 extending at a predetermined radius (approximately 5 uun or more). The length of the front surface of the arc-shaped tip 21 (l is (1': τ). The length β2 of the arc of the arc-shaped tip 21 is approximately β2'; 2τ. The length of the bottom surface of the arc-shaped tip 21 is Sa13 is Jt3ζ5/2
It is τ. A substantially trapezoidal base portion 22 is formed continuously from the arcuate tip portion 21 . The length of the upper side of the trapezoidal base 22 is jt3 ('': 5/2τ), and the length of the base is 14 (ζ3
τ). A predetermined angle θ is formed on both sides of the trapezoidal base portion 22.
A pair of chamfered portions 25 with an angle of 1 (approximately 5°) are formed. Continuing from these chamfers 25, a pair of chamfers 35 are roughly formed in the magnetic pole disc part 30 along its radial direction.

The chamfered portions 35 are each formed at a predetermined angle θ2 (0<θ2<45°). (However, θ2=
θ −θ8−θC) A collar portion 26 is formed along a straight line connecting both ends of the front end of the arcuate tip portion 21 to both ends of the bottom side of the trapezoidal base portion 22. The pole tooth 20 has a side surface 28 .

5(a) is a cross-sectional view of the magnetic pole tooth portion 20 seen from AA' in FIG. 4(a), and FIG.
) is a cross-sectional view of the magnetic pole disk portion 81I35 as viewed from 33', and FIG. 5(C) is a cross-sectional view of the magnetic pole disk portion 35 as viewed from CC' in FIG. 4(a).

Chamfered portion 3 shown in FIGS. 5(a), (b), and (c)
The chamfer angles θA10B and θC shown in 5 are the chamfered portion 3.
It is equal to the chamfer angle θ2 of 5. FIG. 6(d) shows a vertical cross section taken along line DD' in FIG. 4(b), which is J3 along the arc length β2 of the arcuate tip portion 21 of the magnetic pole tooth portion 20. FIG. 6(e) does not show a vertical cross-section taken along line E-E' in FIG. 4(b), that is, the joint portion of the arcuate tip portion 21 and the base portion 22. represents the vertical cross-section extending from F-F'a++ in Fig. 4<b), that is, the joining part between the base 1 (22 and the magnetic pole disk portion 3o). Fig. 6(d)
), (e), (f) The angles OD, θE, θ1 formed by the center Il'l11 of the magnetic pole tooth portion 20 and the side surface 28
．． ．． is 1 and θ. =θ, −〇, , −25°.

The function of the chamfered portion 25 shown in FIGS. 4(a) and (1)) will be explained using J3 in comparison with the prior art. In the conventional type, due to the mutual rotational positional relationship between the rotor magnetic poles (41) and the stator magnetic poles, for example, one point 90 on the rotating magnetic poles (see Fig. 1(b) and Fig. 11) and the opposite Point 9 on the corresponding rotating magnetic pole
0' means a time when the position is directly below a certain single stator tooth-shaped magnetic pole. At this time, the stator magnetic poles are shown in FIGS.
<Since the bridge wave is in close proximity, the permeance is quite low (only 2 air gap lengths), and significant leakage magnetic flux that does not link to the coil is generated through the stator core. At this time, since the leakage magnetic flux is excessive, the tip of the stator core magnetic pole becomes saturated, blocking the original effective magnetic flux, and due to the excessive leakage magnetic flux,
The magnetic potential difference between the different vA pole faces of the rotor was also somewhat relaxed, which also lowered the original effective magnetic flux. Figure 4 (a
By providing the chamfered portion 25 as shown in ) and (b), the permeance of the magnetic flux leakage path is lowered, the leakage magnetic flux is drastically reduced, and the above problem is solved. Note that the angle θ1 of this chamfered portion 25 may be steep, or the arc length of the non-chamfered portion 611 may be steep! ! If 3 is small, it is conceivable that the magnetic noise will become louder and the increase in the average gap length between the stator and rotor magnetic poles will become larger, leading to a decrease in the generated output. On the contrary, as in this embodiment, the magnetic pole width 4 (Fig. 3) is
When J3τ, J3(=5/2τ)-2,5τ, and θ1-5° are selected, the degree of gradual change in the air gap length is smooth even if the effect of reducing leakage magnetic flux through the stator core is excluded; WI confirmed that both the magnetic sound and generated output were equal to or higher than the conventional one due to the effect of reducing the horizontal axis reaction due to the lower permeance with respect to the horizontal axis magnetomotive saw. Also, Fig. 4 (b) Is the tip shaped like an arc as shown in J? The corner of Xf 815 (FIG. 1(a), (point 4 in 11>)) is formed into a curved shape, and as shown in FIG. Since a part of the field coil side is chamfered 35, the leakage magnetic flux shown at φlb in the second N, which conventionally leaked to a large amount m, is greatly reduced by reducing the permeance of the passage. Chamfer 3
5 may be considered inappropriate as a magnetic circuit because it reduces the cross-sectional area of the internal magnetic flux path, but the fact is that most of the magnetic flux flows concentrated on the field coil side, so It has been found that there is no difference in performance between people even if it is removed. Furthermore, as shown in FIG. 6, the magnetic pole side surface 28 is θD',
01. :X-0F Assuming the cape is 25 degrees, J, that is, adjacent magnetic fields (the average magnetic path length between the sides of the ship is expanded to avoid a decrease in permeance, so the leakage magnetic flux at this point φ, φ (see Figure 2) The width has also been reduced to 7a Ilc.

As mentioned above, since the leakage permeance of each part is specifically reduced uniformly as a whole, a large load current flows, and a large armature reaction occurs as a side effect of enlarging the magnetic pole area 20 in Fig. 7. However, the drawbacks of the prior art, such as that of the above-mentioned US patent, are overcome, especially the problem of increased leakage flux under load.

A rotor to which the present invention is applied is used in a 12V80A class vehicle alternator using the same stator and housing.
Comparing the generated output with that of a conventional configuration with the same excitation ampere turn, the full load fF:4 to d5-C output was approximately 7% compared to that of a conventional general trapezoidal Ransol type magnetic pole rotor. In addition, a remarkable effect on the output direction of about 6% was observed for a rotor with four claws as seen in the above-mentioned US Pat. No. 3,004,181. In the above embodiment, as shown in FIG. 5, the cross section of the ball core disk part is chamfered in a straight line as shown in 35, but even if it is chamfered in a curved shape as shown in FIG. can get. Further, in the above embodiment, the sixth
Not shown in the diagram vA4! lii Angle anti-θ of side surface 28, 0, θ
is selected as θD→θEζθF', 25°, and F, but it may also be selected as θ,>θE'=25'>θ2. In other words, magnetic pole tip: between the culms and adjacent different magnetic poles, the blood loss of the claws corresponds to 80.80' in Fig. 6 or Fig. 10, or the tip of the claws is magnetic. Since the path is saturated, the leakage permeance at the tip of the claw and the opposing valley portion 30 of different polarities shown in FIG. 7 decreases, and It is clear that since the wedge can be removed from the base of the tube, it is more suitable as a magnetic circuit.

Ru.

(Effects of the Present Invention) As described above, in the present invention, the magnetic pole south part has an arc-shaped tip portion having a predetermined radius, and each of the magnetic pole disk portions has a circular tip portion that is located at a predetermined radius. Since the magnetic pole disk portion has a pair of substantial chamfered portions 35 in the radial direction corresponding to the tip portions of the vA magnetic pole teeth of opposite polarities adjacent to each other on both sides of the This has the effect of reducing leakage magnetic flux to the opposite pole S'1 of the disk portion.

In the present invention, the above! i-Magnetic pole mountain portion Since the magnetic pole peak portion has a base portion that is substantially tapered from the magnetic pole tip portion, and the approximately trapezoidal cross section is tilted to the right with respect to the tip portion and the base portion, leakage magnetic flux between the sides of the magnetic poles of the rotor is reduced. This has the effect of making it possible to achieve this goal.

The present invention further provides that each of the magnetic pole mountain portions has a pair of chamfered portions 2 formed on both sides of the base portion in an axial direction.
5, it has the effect of further reducing leakage magnetic flux between the sides of the magnetic poles of the rotor.

[Brief explanation of drawings]

Figures 1 (a) i15 and (b) are front and top views of the magnetic pole teeth of the rotor of this secondary alternating current generator, and Figure 2 is a conventional alternating current generator (rotor d5 and stator portion of A diagram showing
FIG. 3 is a diagram showing the relative positional relationship between stator magnetic poles and rotor teeth of an alternator according to an embodiment of the present invention, and FIG.
> and (b) are a front view and a top view of the southern part of the magnetic pole of the rotor according to the embodiment of the present invention, and FIGS. 5(a) to (c) are AA' and B- of FIG. 4(a). 13'11; and c-
Transverse cross-sectional views at each of c' (Fig. 1 (d),
(0)j5 and ([) are l in Figure 4 (1+)) D'
, E-E' J5 and F-F', FIG. 7 shows the 'A' part of the embodiment of the present invention, and FIG. A diagram showing a cross section of the southern part of the rotor magnetic pole of the embodiment, the negative diagram 19 is a portion 41 of the rotor having a conventional ball core without a flange. Figure 10 shows the magnetic pole tooth part as seen from the P direction in Figure 9. Figure 11 shows the l1i in Figure 10 seen from the Qh direction
Figure 12 is a cross-sectional view along line D-D' in Figure 11, and Figure 1:3 shows the leakage magnetic flux caused by proximity bridging that occurs between conventional rotor magnetic poles. 1 and 14 are diagrams showing the positional relationship between the stator and the rotor when the proximity bridging leakage magnetic flux of +lj U occurs in FIG. 13. 1...tin pole part plate part ... Magnetic pole tooth part 21 ... Arc-shaped tip part 22 ... Base part 25.35 ... Take part 26 ... Brim part Agent Ko Asamura Engraving of the drawing (including ig l - no changes) ) No. 5 (￥1 No. 6, Figure 7, Figure 9, Figure 11, Figure 12, Figure 13, Figure 14, Procedural Amendment (formula), November 1932, To the Commissioner of the Japanese Patent Office, 1939. Patent application aT θρ2/, ≦“5 No. 2, name of invention female armpit 1 iron 36 Relationship with the case Patent applicant address, currency Ran day,) Densorin Shiki Company 4, agent 5 , Date of amendment order: July j, 1962

Claims (1)

[Scope of Claims] (1) A pair of magnetic pole disk portions arranged opposite to each other, and a plurality of magnetic pole tooth portions provided at a distance from each other on the periphery of the disk portion, each of which The Il pole tooth portion has a collar portion in the circumferential direction, and the T41 pole tooth portion is alternately meshed with the opposite polarity. Each of the magnetic pole disks ff1ll has an arcuate tip portion having a radius, and each of the magnetic pole disks ff1ll has a radius of the magnetic pole disk portion corresponding to the tip portions of magnetic pole crest portions of opposite polarities disposed adjacently on both sides of the magnetic pole tooth portions. a pair of substantial chamfers (3
5) An alternating current generator characterized by comprising the following. <2. In the alternating current generator according to claim 1, the magnetic pole mountain portion has a base portion that is substantially tapered from the magnetic pole tip portion, and has an approximately base portion with respect to the tip portion d3 and the base portion. An alternating current generator characterized by having an equal cross section. (3) In the AC photoelectric machine according to claim 2, each of the magnetic pole peaks has a pair of chamfered portions (25) formed along the axial direction on both sides of the base portion. An alternating current generator characterized by: